Holes in my lawn

Observation - Holes in my lawn. Description: I found these holes in my lawn in Suffolk. There were several similar holes, some seemingly quite deep, other more shallow. I suspect they might be from a Green Woodpecker feeding. Can anyone confirm this or suggest an alternative, please?

I found these holes in my lawn in Suffolk. There were several similar holes, some seemingly quite deep, other more shallow. I suspect they might be from a Green Woodpecker feeding. Can anyone confirm this or suggest an alternative, please?